Preferred Stock - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011	Dec. 05, 2008 Series A Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Issuance of Preferred stock		7,225	7,225
Preferred stock value		$ 7,120,000	$ 7,225,000
Dividend rate		5.00%
Future dividend rate		9.00%
Liquidation preference		$ 1
Proceeds from the stock offering	3,000
Increase in common stockholders equity	$ 4,960

The cash outflow to reacquire preferred stock during the period.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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- Definition

Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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